Deadly Stroke (Combat)Modifier
With a well-placed strike, you can bring a swift and painful end to most foes.
Benefit: As a standard action, make a single attack with the weapon for which you have Greater Weapon Focus against a stunned or flat-footed opponent. If you hit, you deal double the normal damage and the target takes 1 point of Constitution bleed (see Conditions). The additional damage and bleed is not multiplied on a critical hit.
Essentia: You can apply Deadky Stroke on a full attack on up to 1 + 1 attack / Essentia